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Titolo:
Early flooding of two cultivars of tropical maize. II. Nutritional responses
Autore:
Lizaso, JI; Melendez, LM; Ramirez, R;
Indirizzi:
Univ Ctr Occ Lisandro Alvarado, Barquisimeto, Venezuela Univ Ctr Occ Lisandro Alvarado Barquisimeto Venezuela simeto, Venezuela Fondo Nac Invest Agrop, Maracay 2101, Venezuela Fondo Nac Invest Agrop Maracay Venezuela 2101 p, Maracay 2101, Venezuela
Titolo Testata:
JOURNAL OF PLANT NUTRITION
fascicolo: 7, volume: 24, anno: 2001,
pagine: 997 - 1011
SICI:
0190-4167(2001)24:7<997:EFOTCO>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEA-MAYS-L; ROOT-SYSTEM ARCHITECTURE; TRITICUM-AESTIVUM L; WATERLOGGING DAMAGE; NUTRIENT STATUS; LATERAL ROOTS; PLANTS; SOIL; WATER; TRANSDUCTION;
Keywords:
flooding; nutrients; tropical maize;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Lizaso, JI Iowa State Univ, 124 Davidosn Hall, Ames, IA 50011 USA Iowa State Univ 124 Davidosn Hall Ames IA USA 50011 A 50011 USA
Citazione:
J.I. Lizaso et al., "Early flooding of two cultivars of tropical maize. II. Nutritional responses", J PLANT NUT, 24(7), 2001, pp. 997-1011

Abstract

The level of oxygen in soils affects the bio-availability of nutrients as well as the ability of root systems to uptake and transport water and mineral nutrients. However, efforts addressing management practices to reduce yield losses after transient flooding have had limited success. Since after-drainage nitrogen CN) fertilization has been proposed to mitigate crop damage, a closer examination of plant nutrient acquisition during this period isrequired. In this work, we compare the short-term changes in the tissue levels of macronutrients [N, phosphorus (P), potassium (K), calcium (Ca), andmagnesium (Mg)] in two varieties of tropical maize differing in tolerance to poor soil drainage, after a six day period under water saturated conditions, early during the vegetative growth. Two Venezuelan varieties, one labeled as tolerant and the other as susceptible to limited soil drainage, wereplanted in 10-kg pots and flooded at the seventh-leaf-tip (V4) stage. Treatments included a post-drainage N fertilization. Plant responses were compared to corresponding non-flooded giants. Flooding the soil reduced concentrations of macronutrients in shoots, compared to well aerated plants. Calcium and Mg levels were also reduced in roots, whereas It concentrations increased. after a post-drainage recovery period, nutrient concentration in shoots of flooded plants were above those of non-flooded ones, due to higher uptake rates. The only exception was P, where reduced acquisition appears to limit plant recovery. A post-flood N-urea fertilization increased the concentrations of N, Ca and Mg in shoots, but failed to increase shoot growth after 15 days. Differences in the pattern of Ca accumulation suggested a possible role of Ca nutrition in the tolerance of maize to flooding.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 06:57:28